The "bird test" is popular on TikTok as a way to assess the reciprocity of a relationship. NEW LOOK Sign up to get the inside scoop on today’s biggest stories in markets, tech, and business — delivered daily. download the app Email address Sign up By clicking “Sign Up”, you accept our Terms of Service and Privacy Policy . Now known on TikTok as the "bird test," this tip is being used to subtly check on the reciprocity of all kinds of relationships, from romantic partnerships to friendships. As someone who's relied on it for a decade, I give the bird test an A++, because it finally helped me sort out the worthwhile relationships in my life.

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Persons: John, Julie Gottman, I've, —, Emily Esfahani Smith, who's, aren't, It's Organizations: Service